a-a aaa aak aan aao aap aar aka akk akn ako akp akr an- ana ank ann ano anp anr aoa aok aon aoo aop aor ap- apa apk apn apo app apr ar- ara ark arn aro arp arr ka- kaa kak kan kao kap kar kkk kkn kkp kkr kn- kna knk knn kno knp knr koa kok kon koo kop kor kpa kpk kpn kpo kpp kpr kra krk krn kro krp krr naa nak nan nao nap nar nka nkk nkn nko nkp nkr nna nnk nnn nno nnp no- noa nok non noo nop nor npa npn npo npp npr nra nrk nrn nro nrp nrr oaa oak oan oao oap oar oka okk oko okp okr on- ona onk onn ono onp onr oo- ooa ook oon ooo oop oor op- opa opk opn opo opp opr or- ora ork orn oro orp orr p-p paa pak pan pao pap par pka pkn pko pkp pkr pn- pna pnk pnn pno pnp pnr poa pok pon poo pop por ppa ppk ppn ppo ppp ppr pra prk prn pro prp prr ra- raa rak ran rao rap rar rkk rko rkp rna rnn rno rnp rnr roa rok ron roo rop ror rpa rpk rpn rpo rpp rpr rra rrk rrn rrp rrr